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What voltage should a deep cycle marine battery read?

A fully charged battery will have a reading of between 2.12 and 2.15 volts per cell, or between 12 and 13 volts per battery. At 50% the reading will be 2.03 VPC, and at zero it will be 1.75. For a fully charged cell, specific gravity is 1.265, and 1.13 for a totally discharged cell.

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